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drivers: net: fix memory leak in peak_usb_create_dev

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commit a0b96b4a62745397aee662670cfc2157bac03f55 upstream.

syzbot reported memory leak in peak_usb.
The problem was in case of failure after calling
->dev_init()[2] in peak_usb_create_dev()[1]. The data
allocated int dev_init() wasn't freed, so simple
->dev_free() call fix this problem.

backtrace:
    [<0000000079d6542a>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000079d6542a>] kzalloc include/linux/slab.h:682 [inline]
    [<0000000079d6542a>] pcan_usb_fd_init+0x156/0x210 drivers/net/can/usb/peak_usb/pcan_usb_fd.c:868   [2]
    [<00000000c09f9057>] peak_usb_create_dev drivers/net/can/usb/peak_usb/pcan_usb_core.c:851 [inline] [1]
    [<00000000c09f9057>] peak_usb_probe+0x389/0x490 drivers/net/can/usb/peak_usb/pcan_usb_core.c:949

Reported-by: syzbot+91adee8d9ebb9193d22d@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Skripkin 2021-04-01 16:27:52 +03:00 committed by Greg Kroah-Hartman
parent 32e2f9a708
commit 6e7098f56c
1 changed files with 5 additions and 1 deletions
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6
drivers/net/can/usb/peak_usb/pcan_usb_core.c
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@ -856,7 +856,7 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
if (dev->adapter->dev_set_bus) {
err = dev->adapter->dev_set_bus(dev, 0);
if (err)
goto lbl_unregister_candev;
goto adap_dev_free;
}
/* get device number early */
@ -868,6 +868,10 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
return 0;
adap_dev_free:
if (dev->adapter->dev_free)
dev->adapter->dev_free(dev);
lbl_unregister_candev:
unregister_candev(netdev);